Allow using OpenAI tools like 'web_search_preview'

I would like to do a request like

```
import OpenAI from "openai";
const client = new OpenAI();

const response = await client.responses.create({
    model: "gpt-4.1",
    tools: [ { type: "web_search_preview" } ],
    input: "What was a positive news story from today?",
});

console.log(response.output_text);
```

but was not able to configure `tools: [ { type: "web_search_preview" } ]`